Metal-resin bonded member and method of manufacturing the same

A method of manufacturing a metal-resin bonded member, the method comprising

• an oxidation step of forming an iron oxide layer on a surface of a metal body comprised of an iron-based base material composed of iron or iron alloy, a carbon content in the iron-based base material being 1 mass % or less based on 100 mass % of the iron-based base material as a whole, the formed iron oxide layer being in an electron-deficient state, the oxidation step comprising
• heating at least the surface of the iron-based base material in an oxidation atmosphere at a heating temperature of from 300-350° C. for a time in a range of 0.1 to 2 hours, and
• a bonding step of bonding the iron oxide layer of the metal body and a resin body, the bond comprising a chemical bond, the bonding step comprising
• starting with a formed resin body having a shape, heating a part to be bonded of the formed resin body,
• bringing the heated part to be bonded into contact with the iron oxide layer of the metal body, and
• cooling the part to be bonded,
• the iron oxide layer having a thickness of 160 nm to 400 nm,
• the iron oxide layer comprising 60-40 at % Fe and 40-60 at % O at least at an outermost surface side,
• the iron oxide layer containing at least magnetite Fe3O4,
• the resin body containing, at least at the iron oxide layer side, polyphenylene sulfide, wherein the resin body does not contain reinforcing fibers, and
• the iron oxide layer being in an electron-deficient state prior to chemically bonding with the resin body.

A method of manufacturing a metal-resin bonded member, the method comprising

• an oxidation step of forming an iron oxide layer on a surface of a metal body comprised of an iron-based base material composed of iron or iron alloy, a carbon content in the iron-based base material being 1 mass % or less based on 100 mass % of the iron-based base material as a whole, the formed iron oxide layer being in an electron-deficient state, the oxidation step comprising
• heating at least the surface of the iron-based base material in an oxidation atmosphere at a heating temperature of from 300-350° C. for a time in a range of 0.1 to 2 hours, and
• a bonding step of bonding the iron oxide layer of the metal body and a resin body, the bond comprising a chemical bond, the bonding step comprising
• supplying the iron oxide layer with a softened or molten resin, and
• solidifying the softened or molten resin to form the resin body,
• the iron oxide layer having a thickness of 160 nm to 400 nm,
• the iron oxide layer comprising 60-40 at % Fe and 40-60 at % O at least at an outermost surface side,
• the iron oxide layer containing at least magnetite Fe3O4,
• the resin body is made of, at least at the iron oxide layer side, polyphenylene sulfide, and
• the iron oxide layer being in an electron-deficient state prior to chemically bonding with the resin body.

A method of manufacturing a metal-resin bonded member, the method comprising

• an oxidation step of forming an iron oxide layer on a surface of a metal body comprised of an iron-based base material composed of iron or iron alloy, a carbon content in the iron-based base material being 1 mass % or less based on 100 mass % of the iron-based base material as a whole, the formed iron oxide layer being in an electron-deficient state, the oxidation step comprising
• heating at least the surface of the iron-based base material in an oxidation atmosphere at a heating temperature of from 300-350° C. for a time in a range of 0.1 to 2 hours, and
• a bonding step of bonding the iron oxide layer of the metal body and a resin body,
• the iron oxide layer having a thickness of 160 nm to 400 nm,
• the iron oxide layer comprising 60-40 at % Fe and 40-60 at % O at least at an outermost surface side,
• the iron oxide layer containing at least magnetite Fe3O4,
• the resin body is made of, at least at the iron oxide layer side, polyphenylene sulfide, and
• the iron oxide layer being in an electron-deficient state prior to chemically bonding with the resin body.